Glaze Chemistry Calculator

Evaluate glaze chemistry by entering oxide molar values. Check silica-to-alumina ratio, flux balance, and estimated COE.

Flux Oxides (RO/R2O) - Unity = 1.0

Amphoteric (R2O3)

Glass Former (RO2)

Si:Al Ratio
--
--
Flux Unity Total
--
Est. COE (x10^-7)
--
Alkali Ratio
--
Glaze Fit
--

Analysis

    Understanding Glaze Chemistry

    The Seger unity formula expresses glaze composition in molecular ratios with fluxes summing to 1.0. Key relationships like the silica-to-alumina ratio determine surface quality, durability, and melting behavior.

    Ideal Ranges (Mid-Fire Cone 6)

    • Si:Al ratio: 6-10 for glossy, 3-5 for matte
    • Al2O3: 0.25-0.50 (higher = more durable, stiffer melt)
    • SiO2: 2.5-4.5 (higher = more durable, higher melting point)
    • Alkali fluxes (Na2O + K2O): Keep below 0.40 to avoid crazing

    Related Calculators

    Glaze Recipe Calculator

    Scale glaze batch recipes.

    Kiln Temperature Calculator

    Firing schedules.

    Thermal Shock Calculator

    Thermal shock resistance.

    Clay Shrinkage Calculator

    Clay shrinkage rates.

    Glass Fusing Calculator

    Glass fusing & COE.

    Ceramic Mold Calculator

    Plaster mold ratios.